What part is this?
 

Need some help identifying this 3 ended metal tubing piece on the back of the engine. This is a '79 engine.

As you can see in the second pic, there is some duct tape over it, not sure if it is to cover a crack or just to provide some insulation for the cover underneath it.

Any ideas?

https://imgur.com/732Bewu.jpg
https://imgur.com/ZbZ8cGi.jpg

CIS system, Continuous injection system. Changes made each year to CIS.
For starters see URL

https://jimsbasementworkshop.com/CIS/pages/fuel_hoses.html

Pipe from AAR and AAV to airbox for cold start.
Probably a hole worn in it looking at the top of the air deflector it was rubbing against for 40 odd years.

https://www.pelicanparts.com/More_Info/91111027701M253.htm?pn=911-110-277-01-M253&bt=Y&fs=0&SVSVSI=0796
https://www.pelicanparts.com/More_Info/91111027701OEM.htm?pn=911-110-277-01-OEM&bt=Y&fs=0&SVSVSI=0796

Thanks for the input!

I will peel off that duct tape and see if the pipe is not damaged. If it is only to protect the air deflector, I will wrap it up again :)

I had a hole developing there. It was about 1/4" in diameter and all that was left was about a paper thin spot of material. It was so thin that I could "flap" it with my finger.

I JB welded a portion of a Swiffer handle over the hole. It had the right curve to suit the aluminum tube. It also appeared to be steel so I think it will last at least another 40 years. I am not afraid of any galvanic action since the epoxy sat between the 2 pieces.

I also glued a piece of rubber between the tube and the part below to act as a cushion.